WBC Count CSF

The cerebrospinal fluid white blood cell count measures how many white blood cells are present in the clear fluid that surrounds your brain and spinal cord. This fluid is collected during a lumbar puncture by a trained clinician.

White blood cells are part of your immune system. In this setting the test helps look for signs of inflammation or infection in the central nervous system as part of a broader cerebrospinal fluid analysis.

This test helps evaluate symptoms such as severe headache, fever with neck stiffness, confusion, seizures, or other concerning neurologic changes. A higher white cell count in this fluid can point to infections like meningitis or encephalitis, inflammation after a procedure, autoimmune conditions, or irritation from bleeding.

Your clinician interprets the count together with other cerebrospinal fluid results, such as cell types, protein and glucose, and microbiology testing, plus your examination and imaging. This combined picture guides decisions about urgent treatment, hospital care, and follow up testing.

Results are interpreted in context. A higher count suggests inflammation or infection, while a very low count may be normal or may occur early in illness or after treatment has started. The mix of cell types can provide clues to the cause, but it is not diagnostic on its own.

Blood that enters the sample during the procedure can artificially raise the count. Laboratories and clinicians consider sample appearance, red blood cells, and other markers to judge whether a correction is needed. If results and symptoms do not align, your clinician may recommend repeat sampling or additional tests such as cultures or molecular studies. Ask how your results fit with your overall clinical picture and what steps come next.